BIRDS OF NORTH AND MIDDLE AMERICA. 557 



malar stripe of white, extending- from base of mandible to sides of 

 neck, anteriorly confluent on chin; whole throat and chest uniform 

 black; rest of under parts white, broadl\" streaked laterall}^ with black; 

 hindneck, back, scapulars, rump, and upper tail-coverts slate-gray or 

 plumbeous, more or less streaked (except on hindneck, and sometunes 

 on rump) with bhick; wings and tail black or dusky with gray edgings, 

 the middle and greater wing-coverts broadly tipped with white, form- 

 ing two conspicuous wing-bands; inner webs of two outermost rectrices 

 mostly (sometimes entireW) white, the third rectrix with terminal half 

 or more white, the fourth also with more or less white on terminal 

 portion; bill black; iris brown; legs and feet duslvy brown, sometimes 

 nearly black. 



Adult male hi axdmnn and to inter. — Similar to the spring and sum- 

 mer plumage, but gray of upper parts tinged with brown, and with 

 black streaks apparent only on back and upper tail-coverts, where more 

 or less concealed. 



Adult fen ude in spring and summer. — Sometimes scarcely different 

 from the adult male, having the pileum and whole throat uniform 

 black, as in that sex, but with gray of upper parts duller; usually, 

 however, with the pileum gray (except laterally), streaked with l)lack; 

 the throat mostly white (the feathers dusky or grayish beneath the 

 surface) with more or less of a black or dusky patch on each side of 

 lower throat; white of under parts less pure, with streaks on sides and 

 flanks narrower and less deeply black (grayish dusky); gray of upper 

 parts duller, with dusky streaks on back and upper tail-coverts much 

 narrower, sometimes nearly obsolete. 



Adidt female in fall and winter. — Similar to the summer dress but 

 plumage much softer, and dusky streaks on back and upper tail-coverts 

 obsolete or entirely wanting. 



Ymmg male in first autumn and winter. — Similar to the adult male 

 of corresponding season, but gray of upper parts more strongly 

 washed with brown, pileum brownish gray except laterally and ante- 

 riorly, streaks on back and upper tail-coverts obsolete or concealed, 

 black of throat broken by whitish tips to the feathers, and white of 

 under parts tinged with j^ellowish. 



Young female in first autumn and winter. — Above plain brownish 

 gray (mouse gray), including pileum, the latter margined laterally 

 with dusky; otherwise as in adult female of corresponding season, but 

 general dull white of under parts stronglj^ tinged with brown, espe- 

 cially on sides and flanks, where the dusky streaks are less distinct. 



Adult ;w«Zg.— Length (skins), 105-118^ (112.5); wing, 59.6-66.6 

 (62.2); tail, 48.8-55 (50.5); exposed culmen, 8.2-9.6 (9.2); tarsus, 

 16.8-1S.8 (17.7); middle toe, 9.8-11.2 (10,3).^ 



^Ten specimens. 



